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bbassieandClaude Fable 5.1
788ae17657
Add opt-in UDP messaging between the host and the Factorio server using the --enable-lua-udp option of Factorio 2.0.59+. When factorio.enable_lua_udp is set the instance binds a localhost UDP socket, starts Factorio with --enable-lua-udp on factorio.lua_udp_port (random if null, like the RCON port) and tells the clusterio module the host port via clusterio_private.update_instance. Data from Factorio is sent with clusterio_api.send_udp(channel, data) in the same IPC format as send_json, so plugins receive it through the existing ipc-<channel> events. Packets not sent from the Lua UDP port are ignored, as that is the only unauthenticated way into the IPC handler. Data to Factorio is sent with the new sendUdp method on instances and instance plugins, and is dispatched in-game as on_udp_packet_received events by polling helpers.recv_udp every tick from the clusterio module. Plugins requiring UDP declare the new LuaUdp feature flag, which like SavePatching and ScriptCommands refuses to load the plugin on instances without the option enabled. Verified against a headless 2.1.17 server: send_udp and recv_udp are silent no-ops when the option is off, so a stale port in a save that is moved to an instance without UDP does no harm. The integration test matrix now starts the instance with UDP enabled on Factorio 2.0.59+ and round trips a player event over it. Closes #969 Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>